Commit | Line | Data |
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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
847b173e TH |
2 | /* |
3 | * security/tomoyo/gc.c | |
4 | * | |
0f2a55d5 | 5 | * Copyright (C) 2005-2011 NTT DATA CORPORATION |
847b173e TH |
6 | */ |
7 | ||
8 | #include "common.h" | |
9 | #include <linux/kthread.h> | |
5a0e3ad6 | 10 | #include <linux/slab.h> |
847b173e | 11 | |
a427fd14 TH |
12 | /** |
13 | * tomoyo_memory_free - Free memory for elements. | |
14 | * | |
15 | * @ptr: Pointer to allocated memory. | |
16 | * | |
17 | * Returns nothing. | |
18 | * | |
19 | * Caller holds tomoyo_policy_lock mutex. | |
20 | */ | |
21 | static inline void tomoyo_memory_free(void *ptr) | |
22 | { | |
23 | tomoyo_memory_used[TOMOYO_MEMORY_POLICY] -= ksize(ptr); | |
24 | kfree(ptr); | |
25 | } | |
26 | ||
2e503bbb TH |
27 | /* The list for "struct tomoyo_io_buffer". */ |
28 | static LIST_HEAD(tomoyo_io_buffer_list); | |
29 | /* Lock for protecting tomoyo_io_buffer_list. */ | |
30 | static DEFINE_SPINLOCK(tomoyo_io_buffer_list_lock); | |
31 | ||
2e503bbb TH |
32 | /** |
33 | * tomoyo_struct_used_by_io_buffer - Check whether the list element is used by /sys/kernel/security/tomoyo/ users or not. | |
34 | * | |
35 | * @element: Pointer to "struct list_head". | |
36 | * | |
37 | * Returns true if @element is used by /sys/kernel/security/tomoyo/ users, | |
38 | * false otherwise. | |
39 | */ | |
40 | static bool tomoyo_struct_used_by_io_buffer(const struct list_head *element) | |
41 | { | |
42 | struct tomoyo_io_buffer *head; | |
43 | bool in_use = false; | |
44 | ||
45 | spin_lock(&tomoyo_io_buffer_list_lock); | |
46 | list_for_each_entry(head, &tomoyo_io_buffer_list, list) { | |
47 | head->users++; | |
48 | spin_unlock(&tomoyo_io_buffer_list_lock); | |
f9732ea1 | 49 | mutex_lock(&head->io_sem); |
2e503bbb TH |
50 | if (head->r.domain == element || head->r.group == element || |
51 | head->r.acl == element || &head->w.domain->list == element) | |
52 | in_use = true; | |
53 | mutex_unlock(&head->io_sem); | |
2e503bbb TH |
54 | spin_lock(&tomoyo_io_buffer_list_lock); |
55 | head->users--; | |
56 | if (in_use) | |
57 | break; | |
58 | } | |
59 | spin_unlock(&tomoyo_io_buffer_list_lock); | |
60 | return in_use; | |
61 | } | |
62 | ||
63 | /** | |
64 | * tomoyo_name_used_by_io_buffer - Check whether the string is used by /sys/kernel/security/tomoyo/ users or not. | |
65 | * | |
66 | * @string: String to check. | |
2e503bbb TH |
67 | * |
68 | * Returns true if @string is used by /sys/kernel/security/tomoyo/ users, | |
69 | * false otherwise. | |
70 | */ | |
f9732ea1 | 71 | static bool tomoyo_name_used_by_io_buffer(const char *string) |
2e503bbb TH |
72 | { |
73 | struct tomoyo_io_buffer *head; | |
f9732ea1 | 74 | const size_t size = strlen(string) + 1; |
2e503bbb TH |
75 | bool in_use = false; |
76 | ||
77 | spin_lock(&tomoyo_io_buffer_list_lock); | |
78 | list_for_each_entry(head, &tomoyo_io_buffer_list, list) { | |
79 | int i; | |
80 | head->users++; | |
81 | spin_unlock(&tomoyo_io_buffer_list_lock); | |
f9732ea1 | 82 | mutex_lock(&head->io_sem); |
2e503bbb TH |
83 | for (i = 0; i < TOMOYO_MAX_IO_READ_QUEUE; i++) { |
84 | const char *w = head->r.w[i]; | |
85 | if (w < string || w > string + size) | |
86 | continue; | |
87 | in_use = true; | |
88 | break; | |
89 | } | |
90 | mutex_unlock(&head->io_sem); | |
2e503bbb TH |
91 | spin_lock(&tomoyo_io_buffer_list_lock); |
92 | head->users--; | |
93 | if (in_use) | |
94 | break; | |
95 | } | |
96 | spin_unlock(&tomoyo_io_buffer_list_lock); | |
97 | return in_use; | |
98 | } | |
99 | ||
0df7e8b8 TH |
100 | /** |
101 | * tomoyo_del_transition_control - Delete members in "struct tomoyo_transition_control". | |
102 | * | |
103 | * @element: Pointer to "struct list_head". | |
104 | * | |
105 | * Returns nothing. | |
106 | */ | |
f9732ea1 | 107 | static inline void tomoyo_del_transition_control(struct list_head *element) |
847b173e | 108 | { |
5448ec4f | 109 | struct tomoyo_transition_control *ptr = |
e79acf0e | 110 | container_of(element, typeof(*ptr), head.list); |
847b173e TH |
111 | tomoyo_put_name(ptr->domainname); |
112 | tomoyo_put_name(ptr->program); | |
113 | } | |
114 | ||
0df7e8b8 TH |
115 | /** |
116 | * tomoyo_del_aggregator - Delete members in "struct tomoyo_aggregator". | |
117 | * | |
118 | * @element: Pointer to "struct list_head". | |
119 | * | |
120 | * Returns nothing. | |
121 | */ | |
f9732ea1 | 122 | static inline void tomoyo_del_aggregator(struct list_head *element) |
1084307c | 123 | { |
e2bf6907 | 124 | struct tomoyo_aggregator *ptr = |
e79acf0e | 125 | container_of(element, typeof(*ptr), head.list); |
1084307c TH |
126 | tomoyo_put_name(ptr->original_name); |
127 | tomoyo_put_name(ptr->aggregated_name); | |
128 | } | |
129 | ||
0df7e8b8 TH |
130 | /** |
131 | * tomoyo_del_manager - Delete members in "struct tomoyo_manager". | |
132 | * | |
133 | * @element: Pointer to "struct list_head". | |
134 | * | |
135 | * Returns nothing. | |
136 | */ | |
f9732ea1 | 137 | static inline void tomoyo_del_manager(struct list_head *element) |
847b173e | 138 | { |
e2bf6907 | 139 | struct tomoyo_manager *ptr = |
e79acf0e | 140 | container_of(element, typeof(*ptr), head.list); |
847b173e TH |
141 | tomoyo_put_name(ptr->manager); |
142 | } | |
143 | ||
0df7e8b8 TH |
144 | /** |
145 | * tomoyo_del_acl - Delete members in "struct tomoyo_acl_info". | |
146 | * | |
147 | * @element: Pointer to "struct list_head". | |
148 | * | |
149 | * Returns nothing. | |
150 | */ | |
e79acf0e | 151 | static void tomoyo_del_acl(struct list_head *element) |
847b173e | 152 | { |
e79acf0e TH |
153 | struct tomoyo_acl_info *acl = |
154 | container_of(element, typeof(*acl), list); | |
2066a361 | 155 | tomoyo_put_condition(acl->cond); |
847b173e | 156 | switch (acl->type) { |
7ef61233 | 157 | case TOMOYO_TYPE_PATH_ACL: |
847b173e | 158 | { |
7ef61233 | 159 | struct tomoyo_path_acl *entry |
847b173e | 160 | = container_of(acl, typeof(*entry), head); |
7762fbff | 161 | tomoyo_put_name_union(&entry->name); |
847b173e TH |
162 | } |
163 | break; | |
7ef61233 | 164 | case TOMOYO_TYPE_PATH2_ACL: |
847b173e | 165 | { |
7ef61233 | 166 | struct tomoyo_path2_acl *entry |
847b173e | 167 | = container_of(acl, typeof(*entry), head); |
7762fbff TH |
168 | tomoyo_put_name_union(&entry->name1); |
169 | tomoyo_put_name_union(&entry->name2); | |
847b173e TH |
170 | } |
171 | break; | |
a1f9bb6a TH |
172 | case TOMOYO_TYPE_PATH_NUMBER_ACL: |
173 | { | |
174 | struct tomoyo_path_number_acl *entry | |
175 | = container_of(acl, typeof(*entry), head); | |
176 | tomoyo_put_name_union(&entry->name); | |
177 | tomoyo_put_number_union(&entry->number); | |
178 | } | |
179 | break; | |
75093152 | 180 | case TOMOYO_TYPE_MKDEV_ACL: |
a1f9bb6a | 181 | { |
75093152 | 182 | struct tomoyo_mkdev_acl *entry |
a1f9bb6a TH |
183 | = container_of(acl, typeof(*entry), head); |
184 | tomoyo_put_name_union(&entry->name); | |
185 | tomoyo_put_number_union(&entry->mode); | |
186 | tomoyo_put_number_union(&entry->major); | |
187 | tomoyo_put_number_union(&entry->minor); | |
188 | } | |
189 | break; | |
2106ccd9 TH |
190 | case TOMOYO_TYPE_MOUNT_ACL: |
191 | { | |
192 | struct tomoyo_mount_acl *entry | |
193 | = container_of(acl, typeof(*entry), head); | |
194 | tomoyo_put_name_union(&entry->dev_name); | |
195 | tomoyo_put_name_union(&entry->dir_name); | |
196 | tomoyo_put_name_union(&entry->fs_type); | |
197 | tomoyo_put_number_union(&entry->flags); | |
198 | } | |
199 | break; | |
d58e0da8 TH |
200 | case TOMOYO_TYPE_ENV_ACL: |
201 | { | |
202 | struct tomoyo_env_acl *entry = | |
203 | container_of(acl, typeof(*entry), head); | |
204 | ||
205 | tomoyo_put_name(entry->env); | |
206 | } | |
207 | break; | |
059d84db TH |
208 | case TOMOYO_TYPE_INET_ACL: |
209 | { | |
210 | struct tomoyo_inet_acl *entry = | |
211 | container_of(acl, typeof(*entry), head); | |
212 | ||
213 | tomoyo_put_group(entry->address.group); | |
214 | tomoyo_put_number_union(&entry->port); | |
215 | } | |
216 | break; | |
217 | case TOMOYO_TYPE_UNIX_ACL: | |
218 | { | |
219 | struct tomoyo_unix_acl *entry = | |
220 | container_of(acl, typeof(*entry), head); | |
221 | ||
222 | tomoyo_put_name_union(&entry->name); | |
223 | } | |
224 | break; | |
545a7260 TH |
225 | case TOMOYO_TYPE_MANUAL_TASK_ACL: |
226 | { | |
227 | struct tomoyo_task_acl *entry = | |
228 | container_of(acl, typeof(*entry), head); | |
229 | tomoyo_put_name(entry->domainname); | |
230 | } | |
231 | break; | |
847b173e TH |
232 | } |
233 | } | |
234 | ||
2e503bbb TH |
235 | /** |
236 | * tomoyo_del_domain - Delete members in "struct tomoyo_domain_info". | |
237 | * | |
238 | * @element: Pointer to "struct list_head". | |
239 | * | |
f9732ea1 | 240 | * Returns nothing. |
a427fd14 TH |
241 | * |
242 | * Caller holds tomoyo_policy_lock mutex. | |
2e503bbb | 243 | */ |
f9732ea1 | 244 | static inline void tomoyo_del_domain(struct list_head *element) |
847b173e | 245 | { |
e79acf0e TH |
246 | struct tomoyo_domain_info *domain = |
247 | container_of(element, typeof(*domain), list); | |
847b173e TH |
248 | struct tomoyo_acl_info *acl; |
249 | struct tomoyo_acl_info *tmp; | |
250 | /* | |
f9732ea1 TH |
251 | * Since this domain is referenced from neither |
252 | * "struct tomoyo_io_buffer" nor "struct cred"->security, we can delete | |
253 | * elements without checking for is_deleted flag. | |
847b173e | 254 | */ |
847b173e | 255 | list_for_each_entry_safe(acl, tmp, &domain->acl_info_list, list) { |
e79acf0e | 256 | tomoyo_del_acl(&acl->list); |
847b173e TH |
257 | tomoyo_memory_free(acl); |
258 | } | |
259 | tomoyo_put_name(domain->domainname); | |
847b173e TH |
260 | } |
261 | ||
2066a361 TH |
262 | /** |
263 | * tomoyo_del_condition - Delete members in "struct tomoyo_condition". | |
264 | * | |
265 | * @element: Pointer to "struct list_head". | |
266 | * | |
267 | * Returns nothing. | |
268 | */ | |
269 | void tomoyo_del_condition(struct list_head *element) | |
270 | { | |
271 | struct tomoyo_condition *cond = container_of(element, typeof(*cond), | |
272 | head.list); | |
273 | const u16 condc = cond->condc; | |
274 | const u16 numbers_count = cond->numbers_count; | |
2ca9bf45 | 275 | const u16 names_count = cond->names_count; |
5b636857 TH |
276 | const u16 argc = cond->argc; |
277 | const u16 envc = cond->envc; | |
2066a361 TH |
278 | unsigned int i; |
279 | const struct tomoyo_condition_element *condp | |
280 | = (const struct tomoyo_condition_element *) (cond + 1); | |
281 | struct tomoyo_number_union *numbers_p | |
282 | = (struct tomoyo_number_union *) (condp + condc); | |
2ca9bf45 TH |
283 | struct tomoyo_name_union *names_p |
284 | = (struct tomoyo_name_union *) (numbers_p + numbers_count); | |
5b636857 TH |
285 | const struct tomoyo_argv *argv |
286 | = (const struct tomoyo_argv *) (names_p + names_count); | |
287 | const struct tomoyo_envp *envp | |
288 | = (const struct tomoyo_envp *) (argv + argc); | |
2066a361 TH |
289 | for (i = 0; i < numbers_count; i++) |
290 | tomoyo_put_number_union(numbers_p++); | |
2ca9bf45 TH |
291 | for (i = 0; i < names_count; i++) |
292 | tomoyo_put_name_union(names_p++); | |
5b636857 TH |
293 | for (i = 0; i < argc; argv++, i++) |
294 | tomoyo_put_name(argv->value); | |
295 | for (i = 0; i < envc; envp++, i++) { | |
296 | tomoyo_put_name(envp->name); | |
297 | tomoyo_put_name(envp->value); | |
298 | } | |
2066a361 | 299 | } |
847b173e | 300 | |
0df7e8b8 TH |
301 | /** |
302 | * tomoyo_del_name - Delete members in "struct tomoyo_name". | |
303 | * | |
304 | * @element: Pointer to "struct list_head". | |
305 | * | |
306 | * Returns nothing. | |
307 | */ | |
f9732ea1 | 308 | static inline void tomoyo_del_name(struct list_head *element) |
847b173e | 309 | { |
f9732ea1 | 310 | /* Nothing to do. */ |
847b173e TH |
311 | } |
312 | ||
0df7e8b8 TH |
313 | /** |
314 | * tomoyo_del_path_group - Delete members in "struct tomoyo_path_group". | |
315 | * | |
316 | * @element: Pointer to "struct list_head". | |
317 | * | |
318 | * Returns nothing. | |
319 | */ | |
f9732ea1 | 320 | static inline void tomoyo_del_path_group(struct list_head *element) |
7762fbff | 321 | { |
a98aa4de | 322 | struct tomoyo_path_group *member = |
e79acf0e | 323 | container_of(element, typeof(*member), head.list); |
7762fbff TH |
324 | tomoyo_put_name(member->member_name); |
325 | } | |
326 | ||
0df7e8b8 TH |
327 | /** |
328 | * tomoyo_del_group - Delete "struct tomoyo_group". | |
329 | * | |
330 | * @element: Pointer to "struct list_head". | |
331 | * | |
332 | * Returns nothing. | |
333 | */ | |
f9732ea1 | 334 | static inline void tomoyo_del_group(struct list_head *element) |
7762fbff | 335 | { |
a98aa4de | 336 | struct tomoyo_group *group = |
0df7e8b8 | 337 | container_of(element, typeof(*group), head.list); |
7762fbff TH |
338 | tomoyo_put_name(group->group_name); |
339 | } | |
340 | ||
059d84db TH |
341 | /** |
342 | * tomoyo_del_address_group - Delete members in "struct tomoyo_address_group". | |
343 | * | |
344 | * @element: Pointer to "struct list_head". | |
345 | * | |
346 | * Returns nothing. | |
347 | */ | |
348 | static inline void tomoyo_del_address_group(struct list_head *element) | |
349 | { | |
350 | /* Nothing to do. */ | |
351 | } | |
352 | ||
0df7e8b8 TH |
353 | /** |
354 | * tomoyo_del_number_group - Delete members in "struct tomoyo_number_group". | |
355 | * | |
356 | * @element: Pointer to "struct list_head". | |
357 | * | |
358 | * Returns nothing. | |
359 | */ | |
f9732ea1 | 360 | static inline void tomoyo_del_number_group(struct list_head *element) |
4c3e9e2d | 361 | { |
f9732ea1 TH |
362 | /* Nothing to do. */ |
363 | } | |
364 | ||
365 | /** | |
366 | * tomoyo_try_to_gc - Try to kfree() an entry. | |
367 | * | |
368 | * @type: One of values in "enum tomoyo_policy_id". | |
369 | * @element: Pointer to "struct list_head". | |
370 | * | |
371 | * Returns nothing. | |
372 | * | |
373 | * Caller holds tomoyo_policy_lock mutex. | |
374 | */ | |
375 | static void tomoyo_try_to_gc(const enum tomoyo_policy_id type, | |
376 | struct list_head *element) | |
377 | { | |
378 | /* | |
379 | * __list_del_entry() guarantees that the list element became no longer | |
380 | * reachable from the list which the element was originally on (e.g. | |
381 | * tomoyo_domain_list). Also, synchronize_srcu() guarantees that the | |
382 | * list element became no longer referenced by syscall users. | |
383 | */ | |
384 | __list_del_entry(element); | |
385 | mutex_unlock(&tomoyo_policy_lock); | |
386 | synchronize_srcu(&tomoyo_ss); | |
387 | /* | |
388 | * However, there are two users which may still be using the list | |
389 | * element. We need to defer until both users forget this element. | |
390 | * | |
391 | * Don't kfree() until "struct tomoyo_io_buffer"->r.{domain,group,acl} | |
392 | * and "struct tomoyo_io_buffer"->w.domain forget this element. | |
393 | */ | |
394 | if (tomoyo_struct_used_by_io_buffer(element)) | |
395 | goto reinject; | |
396 | switch (type) { | |
397 | case TOMOYO_ID_TRANSITION_CONTROL: | |
398 | tomoyo_del_transition_control(element); | |
399 | break; | |
400 | case TOMOYO_ID_MANAGER: | |
401 | tomoyo_del_manager(element); | |
402 | break; | |
403 | case TOMOYO_ID_AGGREGATOR: | |
404 | tomoyo_del_aggregator(element); | |
405 | break; | |
406 | case TOMOYO_ID_GROUP: | |
407 | tomoyo_del_group(element); | |
408 | break; | |
409 | case TOMOYO_ID_PATH_GROUP: | |
410 | tomoyo_del_path_group(element); | |
411 | break; | |
412 | case TOMOYO_ID_ADDRESS_GROUP: | |
413 | tomoyo_del_address_group(element); | |
414 | break; | |
415 | case TOMOYO_ID_NUMBER_GROUP: | |
416 | tomoyo_del_number_group(element); | |
417 | break; | |
418 | case TOMOYO_ID_CONDITION: | |
419 | tomoyo_del_condition(element); | |
420 | break; | |
421 | case TOMOYO_ID_NAME: | |
422 | /* | |
423 | * Don't kfree() until all "struct tomoyo_io_buffer"->r.w[] | |
424 | * forget this element. | |
425 | */ | |
426 | if (tomoyo_name_used_by_io_buffer | |
427 | (container_of(element, typeof(struct tomoyo_name), | |
428 | head.list)->entry.name)) | |
429 | goto reinject; | |
430 | tomoyo_del_name(element); | |
431 | break; | |
432 | case TOMOYO_ID_ACL: | |
433 | tomoyo_del_acl(element); | |
434 | break; | |
435 | case TOMOYO_ID_DOMAIN: | |
436 | /* | |
437 | * Don't kfree() until all "struct cred"->security forget this | |
438 | * element. | |
439 | */ | |
440 | if (atomic_read(&container_of | |
441 | (element, typeof(struct tomoyo_domain_info), | |
442 | list)->users)) | |
443 | goto reinject; | |
f9732ea1 TH |
444 | break; |
445 | case TOMOYO_MAX_POLICY: | |
446 | break; | |
447 | } | |
448 | mutex_lock(&tomoyo_policy_lock); | |
a427fd14 TH |
449 | if (type == TOMOYO_ID_DOMAIN) |
450 | tomoyo_del_domain(element); | |
f9732ea1 TH |
451 | tomoyo_memory_free(element); |
452 | return; | |
453 | reinject: | |
454 | /* | |
455 | * We can safely reinject this element here bacause | |
456 | * (1) Appending list elements and removing list elements are protected | |
457 | * by tomoyo_policy_lock mutex. | |
458 | * (2) Only this function removes list elements and this function is | |
459 | * exclusively executed by tomoyo_gc_mutex mutex. | |
460 | * are true. | |
461 | */ | |
462 | mutex_lock(&tomoyo_policy_lock); | |
463 | list_add_rcu(element, element->prev); | |
4c3e9e2d TH |
464 | } |
465 | ||
0df7e8b8 TH |
466 | /** |
467 | * tomoyo_collect_member - Delete elements with "struct tomoyo_acl_head". | |
468 | * | |
469 | * @id: One of values in "enum tomoyo_policy_id". | |
470 | * @member_list: Pointer to "struct list_head". | |
471 | * | |
f9732ea1 | 472 | * Returns nothing. |
0df7e8b8 | 473 | */ |
f9732ea1 | 474 | static void tomoyo_collect_member(const enum tomoyo_policy_id id, |
0df7e8b8 | 475 | struct list_head *member_list) |
d2f8b234 TH |
476 | { |
477 | struct tomoyo_acl_head *member; | |
f9732ea1 TH |
478 | struct tomoyo_acl_head *tmp; |
479 | list_for_each_entry_safe(member, tmp, member_list, list) { | |
d2f8b234 TH |
480 | if (!member->is_deleted) |
481 | continue; | |
f9732ea1 TH |
482 | member->is_deleted = TOMOYO_GC_IN_PROGRESS; |
483 | tomoyo_try_to_gc(id, &member->list); | |
d2f8b234 | 484 | } |
d2f8b234 TH |
485 | } |
486 | ||
32997144 TH |
487 | /** |
488 | * tomoyo_collect_acl - Delete elements in "struct tomoyo_domain_info". | |
489 | * | |
490 | * @list: Pointer to "struct list_head". | |
491 | * | |
f9732ea1 | 492 | * Returns nothing. |
32997144 | 493 | */ |
f9732ea1 | 494 | static void tomoyo_collect_acl(struct list_head *list) |
d2f8b234 TH |
495 | { |
496 | struct tomoyo_acl_info *acl; | |
f9732ea1 TH |
497 | struct tomoyo_acl_info *tmp; |
498 | list_for_each_entry_safe(acl, tmp, list, list) { | |
d2f8b234 TH |
499 | if (!acl->is_deleted) |
500 | continue; | |
f9732ea1 TH |
501 | acl->is_deleted = TOMOYO_GC_IN_PROGRESS; |
502 | tomoyo_try_to_gc(TOMOYO_ID_ACL, &acl->list); | |
d2f8b234 | 503 | } |
d2f8b234 TH |
504 | } |
505 | ||
0df7e8b8 | 506 | /** |
f9732ea1 | 507 | * tomoyo_collect_entry - Try to kfree() deleted elements. |
0df7e8b8 TH |
508 | * |
509 | * Returns nothing. | |
510 | */ | |
847b173e TH |
511 | static void tomoyo_collect_entry(void) |
512 | { | |
d2f8b234 | 513 | int i; |
bd03a3e4 TH |
514 | enum tomoyo_policy_id id; |
515 | struct tomoyo_policy_namespace *ns; | |
f9732ea1 | 516 | mutex_lock(&tomoyo_policy_lock); |
847b173e TH |
517 | { |
518 | struct tomoyo_domain_info *domain; | |
f9732ea1 TH |
519 | struct tomoyo_domain_info *tmp; |
520 | list_for_each_entry_safe(domain, tmp, &tomoyo_domain_list, | |
521 | list) { | |
522 | tomoyo_collect_acl(&domain->acl_info_list); | |
847b173e TH |
523 | if (!domain->is_deleted || atomic_read(&domain->users)) |
524 | continue; | |
f9732ea1 | 525 | tomoyo_try_to_gc(TOMOYO_ID_DOMAIN, &domain->list); |
847b173e TH |
526 | } |
527 | } | |
f9732ea1 | 528 | list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) { |
bd03a3e4 | 529 | for (id = 0; id < TOMOYO_MAX_POLICY; id++) |
f9732ea1 | 530 | tomoyo_collect_member(id, &ns->policy_list[id]); |
bd03a3e4 | 531 | for (i = 0; i < TOMOYO_MAX_ACL_GROUPS; i++) |
f9732ea1 TH |
532 | tomoyo_collect_acl(&ns->acl_group[i]); |
533 | } | |
534 | { | |
535 | struct tomoyo_shared_acl_head *ptr; | |
536 | struct tomoyo_shared_acl_head *tmp; | |
537 | list_for_each_entry_safe(ptr, tmp, &tomoyo_condition_list, | |
538 | list) { | |
539 | if (atomic_read(&ptr->users) > 0) | |
540 | continue; | |
541 | atomic_set(&ptr->users, TOMOYO_GC_IN_PROGRESS); | |
542 | tomoyo_try_to_gc(TOMOYO_ID_CONDITION, &ptr->list); | |
543 | } | |
544 | } | |
545 | list_for_each_entry(ns, &tomoyo_namespace_list, namespace_list) { | |
bd03a3e4 TH |
546 | for (i = 0; i < TOMOYO_MAX_GROUP; i++) { |
547 | struct list_head *list = &ns->group_list[i]; | |
548 | struct tomoyo_group *group; | |
f9732ea1 | 549 | struct tomoyo_group *tmp; |
bd03a3e4 TH |
550 | switch (i) { |
551 | case 0: | |
552 | id = TOMOYO_ID_PATH_GROUP; | |
553 | break; | |
059d84db | 554 | case 1: |
bd03a3e4 TH |
555 | id = TOMOYO_ID_NUMBER_GROUP; |
556 | break; | |
059d84db TH |
557 | default: |
558 | id = TOMOYO_ID_ADDRESS_GROUP; | |
559 | break; | |
bd03a3e4 | 560 | } |
f9732ea1 TH |
561 | list_for_each_entry_safe(group, tmp, list, head.list) { |
562 | tomoyo_collect_member(id, &group->member_list); | |
bd03a3e4 | 563 | if (!list_empty(&group->member_list) || |
f9732ea1 | 564 | atomic_read(&group->head.users) > 0) |
bd03a3e4 | 565 | continue; |
f9732ea1 TH |
566 | atomic_set(&group->head.users, |
567 | TOMOYO_GC_IN_PROGRESS); | |
568 | tomoyo_try_to_gc(TOMOYO_ID_GROUP, | |
569 | &group->head.list); | |
bd03a3e4 | 570 | } |
847b173e TH |
571 | } |
572 | } | |
f9732ea1 TH |
573 | for (i = 0; i < TOMOYO_MAX_HASH; i++) { |
574 | struct list_head *list = &tomoyo_name_list[i]; | |
bd03a3e4 | 575 | struct tomoyo_shared_acl_head *ptr; |
f9732ea1 TH |
576 | struct tomoyo_shared_acl_head *tmp; |
577 | list_for_each_entry_safe(ptr, tmp, list, list) { | |
578 | if (atomic_read(&ptr->users) > 0) | |
4c3e9e2d | 579 | continue; |
f9732ea1 TH |
580 | atomic_set(&ptr->users, TOMOYO_GC_IN_PROGRESS); |
581 | tomoyo_try_to_gc(TOMOYO_ID_NAME, &ptr->list); | |
4c3e9e2d TH |
582 | } |
583 | } | |
29282381 | 584 | mutex_unlock(&tomoyo_policy_lock); |
847b173e TH |
585 | } |
586 | ||
0df7e8b8 TH |
587 | /** |
588 | * tomoyo_gc_thread - Garbage collector thread function. | |
589 | * | |
590 | * @unused: Unused. | |
591 | * | |
0df7e8b8 TH |
592 | * Returns 0. |
593 | */ | |
847b173e TH |
594 | static int tomoyo_gc_thread(void *unused) |
595 | { | |
2e503bbb TH |
596 | /* Garbage collector thread is exclusive. */ |
597 | static DEFINE_MUTEX(tomoyo_gc_mutex); | |
598 | if (!mutex_trylock(&tomoyo_gc_mutex)) | |
599 | goto out; | |
f9732ea1 | 600 | tomoyo_collect_entry(); |
2e503bbb TH |
601 | { |
602 | struct tomoyo_io_buffer *head; | |
603 | struct tomoyo_io_buffer *tmp; | |
604 | ||
605 | spin_lock(&tomoyo_io_buffer_list_lock); | |
606 | list_for_each_entry_safe(head, tmp, &tomoyo_io_buffer_list, | |
607 | list) { | |
608 | if (head->users) | |
609 | continue; | |
610 | list_del(&head->list); | |
611 | kfree(head->read_buf); | |
612 | kfree(head->write_buf); | |
613 | kfree(head); | |
847b173e | 614 | } |
2e503bbb | 615 | spin_unlock(&tomoyo_io_buffer_list_lock); |
847b173e | 616 | } |
2e503bbb TH |
617 | mutex_unlock(&tomoyo_gc_mutex); |
618 | out: | |
619 | /* This acts as do_exit(0). */ | |
620 | return 0; | |
847b173e TH |
621 | } |
622 | ||
2e503bbb TH |
623 | /** |
624 | * tomoyo_notify_gc - Register/unregister /sys/kernel/security/tomoyo/ users. | |
625 | * | |
626 | * @head: Pointer to "struct tomoyo_io_buffer". | |
627 | * @is_register: True if register, false if unregister. | |
628 | * | |
629 | * Returns nothing. | |
630 | */ | |
631 | void tomoyo_notify_gc(struct tomoyo_io_buffer *head, const bool is_register) | |
847b173e | 632 | { |
2e503bbb TH |
633 | bool is_write = false; |
634 | ||
635 | spin_lock(&tomoyo_io_buffer_list_lock); | |
636 | if (is_register) { | |
637 | head->users = 1; | |
638 | list_add(&head->list, &tomoyo_io_buffer_list); | |
639 | } else { | |
640 | is_write = head->write_buf != NULL; | |
641 | if (!--head->users) { | |
642 | list_del(&head->list); | |
643 | kfree(head->read_buf); | |
644 | kfree(head->write_buf); | |
645 | kfree(head); | |
646 | } | |
647 | } | |
648 | spin_unlock(&tomoyo_io_buffer_list_lock); | |
40d27378 MD |
649 | if (is_write) |
650 | kthread_run(tomoyo_gc_thread, NULL, "GC for TOMOYO"); | |
847b173e | 651 | } |